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Southern California is beginning what is expected to be a wet week, as the first of three storms makes its way through the region Monday.

Caltrans crews work to cleanup debris along Pacific Coast Highway during a winter storm on Jan. 14, 2019. (Credit: KTLA)

Burn area residents have been preparing all weekend for the showers, which will bring between .5 and 1.5 inches of rain to Los Angeles, Ventura and southern Santa Barbara counties Monday, according to the National Weather Service.

In Malibu, precautionary evacuations are in place at Rayo del Sol Drive and Paseo Canyon Drive in the Trancas area.

Mud and storm runoff have caused Pacific Coast Highway to be shutdown in both direction from Malibu to the Ventura County line, Caltrans officials said.

Some mountain locations could see as much as 2.5 inches of rain.

Six inches to a foot of snow could fall in mountain areas above 5,000 feet. Lower elevations will receive between 1 and 3 inches.

Snowfall could impact travel on the Grapevine, the Weather Service stated.

Caltrans officials were asking motorists to drive with caution in the Gorman area, where snow was beginning to stick to the roadway. Both sides of the 5 Freeway at the Grapevine are closed due to heavy snow and near-freezing weather Monday afternoon.

Mandatory evacuations were issued over the weekend for residents in the Holy Fire burn areas.

The order applied to the Amorose, Alberhill, Glen Ivy A, Glen Ivy B, Glen Eden, Horsethief A, Laguna A, Maitri, McVicker A, Rice and Withrow A neighborhoods, county officials said in a written statement.

A voluntary evacuation warning was also issued for the Holy Fire burn areas in Orange County, where the heaviest rain is expected Monday afternoon through 7 p.m.

A second storm is expected to arrive Tuesday afternoon and bring another inch or so of rain to the region.

The third and final weather system is forecast for Wednesday night into Thursday.